Spa



FIG. 1 is a front view perspective of the spa of the invention;

FIG. 2 is a side view perspective of the spa illustrated in FIG. 1;

FIG. 3 is a plan view of the spa illustrated in FIG. 1;

FIG. 4 is a front side elevation view of the spa illustrated in FIG. 1;

FIG. 5 is a left side and right side elevation view of the spa illustrated in FIG. 1; and,

FIG. 6 is a rear side elevation view of the spa illustrated in FIG. 1.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a spa, as shown and described. 